SU1732492A1 - Device for transmission of speech and digital information over telephone communication lines - Google Patents

Abstract

The invention relates to communication technology, in particular to telephony, and can be used for a network of simultaneous transmission of voice and digital information between user terminals and computer central terminals. The goal is to provide simultaneous transmission of voice and digital information. The device contains a PBX, subscriber units, a central unit, a subscriber data node containing a switch, a data signal receiver, an acoustic signal receiver. The goal is achieved due to the fact that the subscriber data node controls the switching processes of the subscriber units and central units using frequency division of voice and data transmission channels. 1 il.

Description

The invention relates to telecommunications and is used to create a network of simultaneous transmission of voice and digital information between subscriber units and central computer units based on the existing local analogue telephone network using duplex two-wire data transmission equipment.

A device comprising ATCs, subscriber units, central computer units and an automatic switch for data is known. Each of the subscriber units consists of connected to the subscriber line through the low-pass filters of telephone sets and through the high-pass filters of the data transmission equipment. The central unit contains a telephone set and a computer connected to the subscriber line through a low-pass filter, which is connected via a high-pass filter and data transmission equipment. On PBX to subscriber line m

station high-pass filters are connected, and station low-pass filters are connected to telephone exchanges of the PBX. An automatic switch of overtonal digital signals connects the stationary high-pass filters and the subscriber line of the central unit through electronic keys controlled by signals of the control decoder, to the inputs of which special address signals from the central unit are supplied with a computer.

The drawback of the device is the high cost of additional equipment for the simultaneous transmission of voice and digital information.

The aim of the invention is to provide simultaneous transmission of speech and data initiated by subscriber units while effectively using the equipment of the existing telephone network: control devices of telephone sets, abo

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nent lines, switching system and control devices of PBX.

The drawing shows a structural electrical circuit of a device for transmitting voice and digital information over telephone lines.

The device contains PBX 1, subscriber units 2, each of which contains the first telephone device 4 connected to the first subscriber line through the first low pass filter 3 and through the first high frequency filter 5 of the first data transmission equipment the central unit 7 of those connected to the second subscriber line via 8 low-pass filter telephone set 9 and through the second high-pass filter 10 of the second data transmission apparatus 11. The first PBX input-output is connected to the second subscriber line, the second low-pass filter 12 is connected to the second PBX input-output, the third high-pass filter 13 is turned on between the first subscriber line and the third PBX input,

In the subscriber units 2 switches 14. are connected by the input in the first subscriber line. The first output of the switch is connected to the second1 low-pass filter 12, and the second output 14 to the first input of the first loop simulator 15, the input of the data signal receiver 16, the input. Of the acoustic signals receiver 17. The output of the receiver 17 is connected via the first block of the selection of the leading edge with the counting input of the counter 19, the output of which is connected via the installation input of the first trigger 20 to the second input of the first simulator 15 of the loop and the first input of the OR circuit 21.

The output of the OR circuit 21 through the reset input and the output of the second trigger 22 is connected to the control input of the switch 14, the output of the data signal receiver 16 is connected via the second front edge selection block 23 to the second trigger 22 setup input and through the first break selection block 24 trigger 20, the second input of the OR circuit 21 and the reset input of the counter 19.

The second subscriber line is connected to the first input of the second simulator 25 of the loop, the inputs of the ringing frequency receiver 26 and the receiver 27 of the signal Zan, the outputs of which are respectively connected to the setup input and the reset input of the third trigger 28, the output of which is connected to the second input of the second loop simulator 25 .

The device works as follows.

In the initial state, the memory elements of the trigger device 20, 22, 28 and the counter 19 are in the zero state, the first subscriber line through the first output of the switch 14. The low-frequency filter 12 is connected to the second PBX input-output conversations. The telephone connection is made by the subscriber according to a standard procedure with

0 using blocks of a low-frequency telephone channel: 4, 3, the first subscriber line, 14, 12, and the second PBX I / O.

If it is necessary to transfer digital information, the subscriber includes the first data transmission equipment 6 and data signals located in the above-tone frequency spectrum through a filter 8, the first subscriber line, a filter 13 at the input

0 is a data signal receiver 16 consisting, for example, of a filter, a straightener, an average. The second forefront separating unit 23 captures the occurrence of the data signal level and with its output signal 5 puts the second trigger 22 into a single state.

The output signal of the trigger 22, acting on the control input of the switch 14, connects the input of the switch to the third input / output of the exchange used for data transmission. The subscriber picks up the microphone and listens to the acoustic signal. The answer is a station with a frequency of about 425 Hz from the third PBX I / O. This signal also fixes the receiver 17 of the acoustic signal and the first block of the selection of the leading edge, the pulse from which the counter 19 translates into the first state, the Subscriber dials the number of the central

0 block corresponding to the second subscriber line. If the line is busy, the subscriber returns the microphone to its original position, turns off the data transmission equipment and the falling edge of the level

5, the data signal from the output of the trailing edge circuit 24 sets the counter 19, the trigger 20 and, through the OR 2t, the trigger 22 to zero states. If the line is free, then after dialing the number, the leading edge of the first parcel of the intermittent acoustic signal. By controlling elements of the 425 Hz call, through elements 17 and 18, the counter 19 sets to the second state. The resulting single signal at

5, the output of the counter 19 sets the first trigger 20 to one, the output of the trigger 20 turns on the first simulator 15 of the loop and resets the trigger 22 through the OR 21 circuit. The switch returns to the initial state.

A telephone set and low-frequency channel blocks can be used for telephone conversations, and the occupancy of the third I / O PBX simulates block 15, which has a low direct current resistance and high alternating resistance in the on state.

When the subscriber leaves the second subscriber line, in case of its availability, the first ringing current sending from the first 25 Hz PBX input-output is recorded by the ringing receiver 26, the output signal of which sets the third trigger 28 into one state,

The output signal of the trigger 28 includes the second and simulator 25 of the loop, which, imitating the response of the called subscriber, marks the occupied first subscriber line to the central unit. An over-channel digital information transmission channel is formed between the subscriber unit 2 and the central unit 7 via blocks 6, 5, the first subscriber line, 13, 1 second subscriber line, 10 and 11.

After the data transmission session has been completed, the subscriber switches off the data transmission apparatus 6, the disappearance of the data signal fixes the block of the falling edge 24, which, with its output pulse, sets the elements 19,20 and 22 to the initial state. After the trigger 20 has been set to the zero state, the loop 15 is turned off, the pick up signal of the caller is simulated. At the same time, in the first subscriber line of the called subscriber, the acoustic signal is transmitted at a frequency of about 425 Hz. This signal fixes the receiver 27 of the signal Zan then, which by its output sets the trigger 28 to the zero state and turns off the second simulator 25 of the loop. The called subscriber is simulated, the ATC devices are released, the device is in the initial state.

It is possible to organize data transmission to the central unit and subscriber unit at the initiative of the central unit with a preliminary agreement on time and exchange. At the same time, having received a ringing signal from a telephone set, the subscriber connects the data transmission apparatus 6.

The device can be used in cases where laying new subscriber lines and additional switching nodes for data transmission is impossible or uneconomical, but it is required to simultaneously transmit speech and data by type

capabilities of integrated digital networks.

Claims (1)

Invention Formula A device for transmitting voice and digital information over telephone lines, containing a subscriber unit containing series-connected the first telephone set and the first low-pass filter and the first data transmission equipment and the first high-pass filter connected in series, with the outputs of the first high-pass filters and low frequencies are combined and connected to the first subscriber line, as well as a central unit containing serially connected second data transmission equipment and a second high filter frequency, the output of which through the second subscriber line is connected to the first input-output of the automatic telephone station (PBX), characterized in that, in order to ensure the simultaneous transmission of voice and digital information, a subscriber data node is inserted, containing a switch to the input of which the first subscriber is connected line, the first output switch through the second filter bottom frequency is connected to the second PBX input-output, the third input-output of which is connected to the second output of the switch, the input of the third high-pass filter, the first input of the first loop simulator and the inputs of the data signal receiver and the acoustic signal receiver, the outputs of which are the front and the first block of the front edge are connected respectively to the reset input and the counting input of the counter, the output of which is connected to the installation input of the first trigger, the output of which is connected to the second the first input of the element OR, the second input of which is connected to the output of the block of the falling edge and the reset input of the first trigger, the output of the element OR is connected to the input of the collection of the second trigger, the output of which is connected to the control input of the switch, which is connected to the output the third high-pass filter, the output of the receiver of the data signal is connected to the setup input of the second trigger via the second block of the leading edge, in addition to the second subscriber line are connected to the second th loop simulator, the receiver calling signal and the frequency of the receiver Zan, the output of which is connected to the reset input of the third flip-flop, whose output is connected to a second input of the third flip-flop novochny coupled simulator input of the second loop, and a yield usta- calling frequency receiver, t |